Chuck.



No. 66,0,i2l- Patented 00L 23, |900.

A W. J. PARSUNS.

CHUCK.

(Appxi'cacion med Apr. 2, 1900.)

(No Model.)

UNITED STATES PATENT OFFICE.-

VILLIAM J. PARSONS, OFKMONTAGUE, MASSACHUSETTS, ASSIGNOR TO THE MILLERS FALLS COMPANY, OF MILLERS FALLS, MASSACHUSETTS.

CHUCK.

SPECIFICATION forming part of Letters Patent No. 660.121, dated October 23, 1900.

Appncaion flied April 2, i900. serai no. 11,059. no model.)

To @ZZ whom it may concern.-

Be it known that I, WILLIAM J. PARSONS, a citizen of' the United States of America, and a resident of Montague, in the county of Franklin and State of Massachusetts, have invented certain new and useful Improvements in Chucks, of which the following is a specitication.

My present invention relates more especially to chucks provided with three or more jaws and without the usual socketinto which the jaws are ordinarily drawn.

My special improvements consist of a novel arrangement of the jaws in connection with a truncated cone-follower and other parts, as will be hereinafter more particularly explained.

I'n the drawings, Figure lis a sectional view of the operative parts of the chuck. Fig. 2 is a sectional View on the line 2 2 ot' Fig. l. Fig. 3 is a sectional view on line 3 3 of Fig. 1. Fig. 4 is a view of the lower end of the cone and jaws with the spindle A and the cap-piece O removed. Fig. 5 represents the truncated cone-follower D. Fig. 6 represents one of the i jaws E.

The chuck consists, essentially, of the following parts: the spindle A, having the lthreaded part a, which threads in the lcappiece O and which has its inner end adapted to iit the hole dl, made in the bottom of conefollower D, as indicated by a. The cone-follower D is shown in Fig. 5, where the sides of the cone are represented by d2 and the slots for the jaws are indicated by d. The shape of the jaw is well shown in Fig. 6, in which the front or jaw properis rep resented by e, the inside edge by e', the connecting-strip by e2, andthe end piece by e3. The piece cgis riveted to the jaw proper or secured in any convenient manner, as shown by e4. The other end of the piece is also secured to the end piece e3 as desired. The three parts may be made all of one piece of metal, if desired. In the slots d of the cone D, near the small end of the cone, is placed the spring f, held in place by a hole d4, drilled in the cone a little wider than the width of the slot d and deeper than said slot into which the spring sets, (see Figs. 3 and 5,) each slot havingits spring. A dat or other form of spring may be used,

though I prefer the spiral form, asshowri. The jaws are placed over the slots d, and it will be observed that the part e5 of the jaw E will rest on the small end of the cone D, that the part e2 of the jaw will rest in the slot d, while the end piece e5 will extend down on the large end or bottom of the cone, as shown in Fig. 4. It will benoticed that the forward end of the p'art e2 will rest on the spring f 6o and will be held in place bythe action of the shell B, which is formed interiorly for a suitable distance to loosely fit the larger end of the cone, and then tapering down smaller and smaller till it ends at the exterior end opening of the shell. (See b b2.) The cap C is preferably screwed to the end of the shell at b.

The operation of the chuck when completed fis substantially as follows: The spindle A being screwed outward the cone-follower D, 7o carrying the jaws E, retires into the shell B, thus allowing the jaws E to open to receive the article between them. The spindle is then turned, forcing the cone-follower outwardlyin the interior of the shell B. As the cone advances the points of the jaws E are forced together by the action of the shell, and the article inserted between the jaws is securely held. Upon screwing the spindle in the opposite direction the jaws will open and 8o the article will be released.

The action of the springf upon the jaw, in connection with thepeculiar shape of the interior of the shell, as described, tends to cause the cone to retire inwardly as the spindle is removed and the jaws to expand as they withdraw with the cone-follower. The springf also tends to steady the part e2 of the jaw. The inner end of the spindle might be suitably secured in the hole d in the larger end 9o of the cone-follower. If this were done, the result of it would be simply this, that the cone-follower would be drawn inwardly by a positive movement in the withdrawal of the spindle. In case no springs were used this might be advantageously done,zthough I prefer the arrangement shown as being simpler and all in all better for the purpose intended.

If the springs or one or more of them were Too to break or become inoperative from any cause, the jaws would still open and the chuck could be eficiently used, though not of course quite as quickly.

The Iinner or "larger end of the cone loosely fits the inner internal recess of the shell, the jaws fitting into the slots d of the cone,-w-ith` the springs f pressing upward or outward on the jaws near the upper end of the slot, keep-l ing the inner end of the jaw even with the. bottom or inner end of the cone, and consequently pressing against the interior of the shell. These peculiarities acting together make a remarkably simple, strong, and effective working chuck and overcome many of the objections found in prior constructions.

I do not confine myself to the exact form of parts described, as these may be varied with-A outdeparting from the spirit of my invention.

Having now described my invention, what I claim, and desire to secure by Letters Patent of the United States, is@

l. The spindle A, having the screw-threaded end a; the shell B, provided with the cap C; `the movable truncated cone-follower D, provided with the slots CZ; the jaws E, suitably formed to beheld in the said slots CZ, and the springs f, all arranged, combined and adapted to operate substantially as described.

2. In a chuck Vthe movable `truncated conefollower D, having the slots cl; in combina` tion with the jaws E, and the springs f,sub stantially as set forth. v

`3. The combination, in a chuck, of the shell B, formed interiori-y as described, with the, movable truncated cone-follower D, having the slots d, the jaws E, `adapted to fi-t and be' held in position bythe action of said slots and the interior of said shell substantially as specified.

il. The combination, in a chuckyof `,the shell B, .a suitable Amovable follower, *having suitable slots 'for the jaws; suitable jaws adapted to l'it into the said slots and springs arranged -t'o'rest-in said slots underneath the said jaws and, in connection with the said shell to close and open `said jaws by theac'tion of a suitable' :spindle operating upon the inner end of the' follower, all arranged and adapted to operate, substantially as and for the purposes set forth.

5. In a chuck, the combination, of a movable truncated cone-follower, provided with i suitable slots; jaws `formed to :fit into and be l.heldin ,place `by said slots; springs beneath the jaws and near the smaller end of said cone and within said slots; and a suitable shell adapted to cooperate with the said cone and jaws, substantially `as and for the purposes herein set forth. p

6. In achuck, the combination of `the movable ltruncated cone-follower D, 'having suitable slots d'2, and a hole d4, to each slot greater in diameter than the width of the slot; the springsf, supported in said holes d4, and jaws E, consisting of the part e, adapted to rest on the `small end of said cone and to extend out- `wa'rdly therefrom and having the piece c2, adapted to enter said slots and provided with theend piece e3, all substantially as and for the vpurposes set forth.

Signed by me at Montague, Massachusetts, this 28th day of March, A. D. 1900.

WILLIAM J. PARSONS.

Witnesses: j GEO. E. Roenes, GEO. Nnvrs. 

